48. The length of a wire is 1.0 m and the area of cross-section is

The length of a wire is 1.0 m and the area of cross-section is 1.0×10^-2 cm² . If the work done for increase in length by 0.2 cm is 0.4 joule, then Young’s modulus of the material of the wire is

(a) 2.0×10¹⁰ N/m²                              (b)  4×10¹⁰ N/m²

(c) 2.0×10¹¹ N/m²                              (d)  2×10¹⁰ N/m²

Answer-c

(6)